Shanghai Maritime University is a public university in Shanghai, People's Republic of China. Shanghai Maritime University is a multidisciplinary university with 6 fields of study: Engineering, Management, Economics, Literature, Science and Law. The university is one of the best Chinese universities for specialisation in maritime, shipping and transport education. Wikipedia.
Wang X.,University of Aalborg |
Blaabjerg F.,University of Aalborg |
Wu W.,Shanghai Maritime University
IEEE Transactions on Power Electronics | Year: 2014
This paper addresses the harmonic stability caused by the interactions among the wideband control of power converters and passive components in an ac power-electronics-based power system. The impedance-based analytical approach is employed and expanded to a meshed and balanced three-phase network which is dominated by multiple current-and voltage-controlled inverters with LCL-and LC-filters. A method of deriving the impedance ratios for the different inverters is proposed by means of the nodal admittance matrix. Thus, the contribution of each inverter to the harmonic stability of the power system can be readily predicted through Nyquist diagrams. Time-domain simulations and experimental tests on a three-inverter-based power system are presented. The results validate the effectiveness of the theoretical approach. © 2014 IEEE.
Wu W.,Shanghai Maritime University |
He Y.,Fsp Powerland Technology Inc. |
Blaabjerg F.,University of Aalborg
IEEE Transactions on Power Electronics | Year: 2012
This paper presents a new topology of higher order power filter for grid-tied voltage-source inverters, named the LLCL filter, which inserts a small inductor in the branch loop of the capacitor in the traditional LCL filter to compose a series resonant circuit at the switching frequency. Particularly, it can attenuate the switching-frequency current ripple components much better than an LCL filter, leading to a decrease in the total inductance and volume. Furthermore, by decreasing the inductance of a grid-side inductor, it raises the characteristic resonance frequency, which is beneficial to the inverter system control. The parameter design criteria of the proposed LLCL filter is also introduced. The comparative analysis and discussions regarding the traditional LCL filter and the proposed LLCL filter have been presented and evaluated through experiment on a 1.8-kW-single-phase grid-tied inverter prototype. © 2011 IEEE.
Zhang H.,Shanghai Maritime University |
Zhang H.,Ohio State University |
Shi Y.,Ohio State University |
Wang J.,University of Victoria
IEEE Transactions on Fuzzy Systems | Year: 2014
This paper focuses on the filter design for nonuniformly sampled nonlinear systems which can be approximated by Takagi-Sugeno (T-S) fuzzy systems. The sampling periods of the measurements are time varying, and the nonuniform observations of the outputs are modeled by a homogenous Markov chain. A mode-dependent estimator with a fast sampling frequency is proposed such that the estimation can track the signal to be estimated with the nonuniformly sampled outputs. The nonlinear systems are discretized with the fast sampling period. By using an augmentation technique, the corresponding stochastic estimation error system is obtained. By studying the stochastic stability and the energy-to-peak performance of the estimation error system, we derive the linear-matrix-inequality-based sufficient conditions. The parameters of the mode-dependent estimator can be calculated by using the proposed iterative algorithm. Two examples are used to demonstrate the design procedure and the efficacy of the proposed design method. © 2013 IEEE.
Wu W.,Shanghai Maritime University |
He Y.,Fsp Powerland Technology Inc. |
Tang T.,Shanghai Maritime University |
Blaabjerg F.,University of Aalborg
IEEE Transactions on Industrial Electronics | Year: 2013
A higher order passive power filter (LLCL filter) for the grid-tied inverter is becoming attractive for industrial applications due to the possibility to reduce the cost of the copper and the magnetic material. However, similar to the conventional LCL filter, the grid-tied inverter is facing control challenges. An active or a passive damping measure can be adopted to suppress the possible resonances between the grid and the inverter. For an application with a stiff grid, a passive damping method is often preferred for its simpleness and low cost. This paper introduces a new passive damping scheme with low power loss for the LLCL filter. Also, a simple engineering design criterion is proposed to find the optimized damping resistor value, which is both effective for the LCL filter and the LLCL filter. The control analysis and the power loss comparison for different filter cases are given. All these are verified through the experiments on a 2-kW single-phase grid-tied inverter prototype using proportional resonant controllers. It is concluded that, compared with the LCL filter, the proposed passive damped LLCL filter can not only save the total filter inductance and reduce the volume of the filter but also reduce the damping power losses for a stiff grid application. © 1982-2012 IEEE.
News Article | February 27, 2017
Jurong East, Singapore, February 27, 2017 --( Currently, there are about 30 Alumni representatives from Harvard University, Beijing University, University of Chicago, Tsinghua University, and National University of Singapore business administration faculty etc have confirmed their participation. And the commitee has also invited 30 entrepreneur representatives from China to join this event. This will definitely enlighten the event. Last year, the representative from Shanghai Maritime University was the champion of the 1st Scholar Cup Golf Challenge that carried out on 19 May 2016. Will your team be the champion of this year? Join them now. Check out the details of this event below:- Date: 11 April 2017 Venue: Orchid Country Club, Singapore Registration Fee: $230 per person (include golfing fee, lunch, dinner, gift, prize) Scoring Rules: 118 holes individual tournament. Team (minimum 4 people, maximum 8 people, join both team and individual tournaments simultaneously) or representative (minimum 4 people, only join individual tournament) can participate. Team tournament will base on team golf scores for first 4 places to decide team ranking for the prize; individual tournament will base on an individual score to decide on the ranking. To register, please contact Dr. Tian Jing, Chief Secretary of Scholar Cup golf Challenge Committee at 0065-9029 5968, or email him at firstname.lastname@example.org Jurong East, Singapore, February 27, 2017 --( PR.com )-- The 2nd Scholar Cup Golf Challenge will be held on 11 April 2017. The objective of this golf challenge is to create an exchange platform for the alumni of the international tertiary institution to expand their network and to develop their careers and businesses.Currently, there are about 30 Alumni representatives from Harvard University, Beijing University, University of Chicago, Tsinghua University, and National University of Singapore business administration faculty etc have confirmed their participation. And the commitee has also invited 30 entrepreneur representatives from China to join this event. This will definitely enlighten the event.Last year, the representative from Shanghai Maritime University was the champion of the 1st Scholar Cup Golf Challenge that carried out on 19 May 2016. Will your team be the champion of this year? Join them now.Check out the details of this event below:-Date: 11 April 2017Venue: Orchid Country Club, SingaporeRegistration Fee: $230 per person (include golfing fee, lunch, dinner, gift, prize)Scoring Rules: 118 holes individual tournament. Team (minimum 4 people, maximum 8 people, join both team and individual tournaments simultaneously) or representative (minimum 4 people, only join individual tournament) can participate. Team tournament will base on team golf scores for first 4 places to decide team ranking for the prize; individual tournament will base on an individual score to decide on the ranking.To register, please contact Dr. Tian Jing, Chief Secretary of Scholar Cup golf Challenge Committee at 0065-9029 5968, or email him at email@example.com Click here to view the list of recent Press Releases from Scholar Cup Golf Challenge Committee
Chen W.,Shanghai Maritime University
Energy Conversion and Management | Year: 2011
In this paper, a wet porous cooling plate has been utilized for building wall. Cooling can be achieved due to the evaporation in the porous plate. A mathematical model on the heat and mass transfer in the unsaturated porous media is developed to analyze the influences of ambient conditions and the porous plate thickness on the cooling performance of the porous evaporative plate. With a decreasing in ambient relative humidity and an increasing in ambient temperature, more cooling of the porous evaporative plate can be supplied for the inside of room. The heat exchange between the inside surface of the porous plate and the air in the room should be intensified to achieve a higher cooling efficiency of the porous plate. The ambient wind speed and the thickness of porous plate also have significance influences on the average temperature of the porous plate. All these results should be taken into account for the utilization of the porous evaporative cooling plate. © 2011 Elsevier Ltd. All rights reserved.
Chen W.,Shanghai Maritime University |
Qu M.,Shanghai Maritime University
Renewable Energy | Year: 2014
In this paper, the chimney is assembled with porous absorber for the indirect-mode solar dryer. Local thermal non-equilibrium (LTNE) exists in the porous absorber, so the double energy equations and Brinkman-Forchheimer extended Darcy model are employed to analyze the heat transfer and flow in the solar porous absorber, and the k-ε turbulent model coupled with the above equations are also used to investigate the influences of the porous absorber inclination and the height of drying system on the heat transfer in the solar dryer. The specific heat capacities (ρc) and thermal conductivity ks have remarkable effects on the average temperature of solar porous absorber in the drying system. The mean temperature of the higher (ρc) Aluminous solar absorber is lower and the top temperature of porous absorber delays due to lower thermal conductivity ks. The inclined angle of porous absorber influences the airflow and temperature field in the solar dryer greatly. With the height of solar dryer changing from 1.41m to 1.81m, the higher airflow velocity and the lower temperature at chimney exit can be achieved. The simulations agree with the published experimental data. All these results should be taken into account for the promotion and application of the solar chimney dryer with porous absorber. © 2013 Elsevier Ltd.
Sun B.,Shanghai Maritime University |
Zhu D.,Shanghai Maritime University |
Yang S.X.,University of Guelph
IEEE Transactions on Industrial Electronics | Year: 2014
In this paper, a new approach of tracking control is investigated for the 7000-m Jiaolong manned submarine vehicle (MSV). First, the formulation of control allocation problem and some background information about tracking control of the 7000-m Jiaolong MSV are presented. Then, a kinematic controller is derived. The filter design using bioinspired model is employed to handle the speed jump problem and to make sure that each thruster is within the saturation limit. The kinematic controller is then extended to incorporate a sliding-mode control technique to complete the dynamic control. The system stability is guaranteed, and tracking errors asymptotically converge to zero by Lyapunov stability theory. Another interesting phenomenon is that the bioinspired method can achieve more satisfactory tracking result with a less control effort compared to a typical backstepping method. Finally, simulations illustrate the performance of the derived cascaded tracking control technique. © 2013 IEEE.
Hu Z.-H.,Shanghai Maritime University
Expert Systems with Applications | Year: 2011
Various disasters with serious results are reported and happen around our lives. Most of them are unconventional contingency events. Emergency relief is an important activity dealing with the disasters to transfer a large number of materials to the destroyed places for casualties and reconstruction for the country, even the world. Container multimodal transportation will play an important role because of its superior characteristics. The relations in the process of supply and transportation build up the container supply chain. It is critical to schedule the multimodal transportation flow of the chain with time efficiency of higher reliability. In this study, the system of container multimodal transportation emergency relief is modeled as an affinity network inspired by the immune system. An integer linear programming model is proposed to build the path selection for container supply chain in the context of emergency relief. The simulation study shows the promising effects of the model. The study is valuable for designing the emergency logistics management system with optimal path selection and flow design of container supply chain in disaster environments. © 2010 Elsevier Ltd. All rights reserved.
Shi W.,Shanghai Maritime University
International Journal of Solids and Structures | Year: 2014
For an infinite elastic plane with a sharp V-notch under the action of symmetrically loading at infinity, the length of crack initiation ahead of the V-notch's tip is estimated according to a modified Griffith approach. Applying a new conservation integral to the perfectly plastic strip (Dugdale model) ahead of the V-notch's tip, the relationship between notch stress intensity factor (NSIF) and notch tip opening displacement (NTOD) is presented. Also, the relationship between NSIF and perfectly plastic strip size (PPSS) is found. Since there are three fracture parameters (NSIF, NTOD, and PPSS) with changeable notch opening angle in two basic relationships, it is necessary to select one critical parameter with changeable notch opening angle or two independent critical parameters, respectively. With the help of a characteristic length, it is found by this new conservation integral that the NSIF, NTOD and energy release rate are equivalent in the case of small-scale yielding. Especially, the characteristic length possesses clear physical meaning and, for example, depends on both the critical NSIF and SIF or both the NTOD and CTOD, respectively, in which SIF and CTOD are from the tip of a crack degenerated from the sharp V-notch. The dependence of NSIF on NTOD and PPSS is presented according to the equivalence, and the critical NSIF depending on the critical NTOD with a notch opening angle is also predicted. 2013 Elsevier Ltd. All rights reserved.